An un-loader is installed on an air compressor to （）.<br>A:bypass the high pressure stage to the low pressure stage on 100% of the air compressors in service<br>B:prevent excessive inter-stage pressure buildup<br>C:control compressor discharge pressure<br>D:remove all but the frictional load during starting

An un-loader is installed on an air compressor to （）.
A:bypass the high pressure stage to the low pressure stage on 100% of the air compressors in service
B:prevent excessive inter-stage pressure buildup
C:control compressor discharge pressure
D:remove all but the frictional load during starting

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